What Is an Audiogram — and How Do You Read One?

If you have ever had a hearing test, you have probably seen your audiogram. It is the graph your audiologist shows you at the end of the evaluation — a collection of symbols scattered across a grid that, to most patients, looks like a connect-the-dots puzzle with no obvious pattern. Understanding what that graph is actually showing you transforms it from an abstract clinical document into a genuinely useful picture of your hearing health.

Here is everything you need to know about what an audiogram is, how to read one, and what it does — and does not — tell you about your hearing.

What an Audiogram Actually Is

An audiogram is a graph that maps your hearing sensitivity across the range of frequencies that matter most for understanding everyday sound and speech. It is the core output of a diagnostic hearing evaluation — a visual record of exactly how much sound, at each pitch, your ears need in order to detect it.

Think of it as a map of your hearing — not a pass/fail score, but a detailed picture showing which parts of the sound spectrum your ears are picking up clearly and which parts they are struggling with. That distinction matters enormously, because hearing loss almost never affects all frequencies equally. Understanding the specific shape of your hearing loss is what guides every subsequent decision about treatment.

The Two Axes — Frequency and Volume

The audiogram has two axes, and understanding each one is the key to reading everything else on the graph.

The horizontal axis — frequency (pitch). Running left to right across the top of the audiogram, the horizontal axis represents frequency, measured in Hertz (Hz). Low numbers on the left represent low-pitched sounds — the rumble of a lawnmower, the bass notes of a voice, and the vowel sounds in speech (A, E, I, O, U). High numbers on the right represent high-pitched sounds — birdsong, the ringing of a phone, and the consonant sounds (S, F, TH, SH, CH, K, P, H) that carry the specific information distinguishing one word from another. Most audiograms display frequencies from 250 Hz on the left to 8,000 Hz on the right, covering the range most critical for understanding everyday speech.

Audiologists sometimes refer to a region of the audiogram called the speech banana — a banana-shaped zone covering the frequencies and volumes where all the sounds of spoken language live. Vowel sounds cluster in the lower-frequency, louder portion of this zone. Consonants cluster in the higher-frequency, softer portion. When your hearing thresholds fall below the speech banana — meaning you cannot detect sounds at the volume and pitch where speech occurs — those specific sounds of language become inaudible to you. The speech banana is one of the most practical tools for understanding why a particular pattern of hearing loss produces the specific listening difficulties a patient experiences.

The vertical axis — loudness (volume). Running top to bottom on the left side of the graph, the vertical axis represents the volume of sound required for you to just barely detect it, measured in decibels hearing level (dB HL). The numbers increase as you go down the page, running from -10 dB at the top (very soft sounds) to 120 dB at the bottom (extremely loud sounds). A point plotted near the top of the graph means you can detect that sound at a very soft volume — which is good. A point plotted near the bottom means you need that sound to be very loud before you can hear it — which indicates hearing loss at that frequency.

The Symbols — What Each One Means

The symbols plotted on the audiogram represent your hearing thresholds — the softest level at which you could just barely detect each test tone during the evaluation.

O (circle) — right ear air conduction. The letter O, plotted in red, represents your right ear's threshold for detecting tones played through headphones or insert earphones. This is typically the first set of measurements taken during a hearing evaluation.

X (cross) — left ear air conduction. The letter X, plotted in blue, represents your left ear's thresholds under the same conditions. Right ear in red, left ear in blue — a color convention that is universal in audiology.

Brackets — bone conduction thresholds. In addition to air conduction testing through headphones, your audiologist may also measure bone conduction — using a small vibrating device placed behind the ear that sends sound directly to the inner ear, bypassing the ear canal and middle ear entirely. The comparison between air conduction and bone conduction thresholds tells the audiologist whether any hearing loss is located in the outer or middle ear (conductive loss), the inner ear or nerve (sensorineural loss), or a combination of both (mixed loss). This distinction directly determines what treatment options are appropriate.

Hearing Loss Categories — What the Degree Means

The vertical position of your thresholds on the audiogram determines the degree of hearing loss at each frequency. Audiologists use a standardized classification system:

Normal hearing: 0 to 25 dB HL. Thresholds in this range mean you can detect very soft sounds at that frequency without difficulty.

Mild hearing loss: 26 to 40 dB HL. You can hear speech in quiet but begin to struggle in background noise or when voices are soft. This is often the range where people first notice the 'I can hear but not understand' complaint — particularly because consonant sounds that carry speech clarity tend to be soft, and mild loss affects them first.

Moderate hearing loss: 41 to 55 dB HL. Speech in quiet requires more effort and begins to be missed regularly. Television volume increases. One-on-one conversations become manageable but group settings become significantly more difficult.

Moderately severe hearing loss: 56 to 70 dB HL. Significant difficulty understanding speech even in quiet. Hearing aids are almost universally recommended at this level.

Severe hearing loss: 71 to 90 dB HL. Speech is largely inaudible without significant amplification. Hearing aids are essential; some patients at this level may eventually be evaluated for cochlear implant candidacy.

Profound hearing loss: 91 dB HL and above. Little to no usable hearing through conventional amplification. Cochlear implantation is typically the most effective intervention.

What the Audiogram Does Not Tell You

As informative as the audiogram is, it has important limitations that every patient deserves to understand — and that a comprehensive evaluation is specifically designed to address.

It measures detection, not understanding. This is the most important limitation of the pure-tone audiogram and the most clinically significant gap between what the test measures and what patients actually experience. The audiogram tells you the softest level at which you can detect a tone — a pure, isolated sound presented in a sound booth under ideal listening conditions. It does not tell you how well you can understand connected speech in the real world, where multiple voices, background noise, reverberation, and rapid speech all compete for your attention simultaneously. Many patients with audiograms showing only mild hearing loss experience profound difficulty understanding speech in restaurants, meetings, and social gatherings — because the audiogram, by itself, does not capture how the auditory system performs under real-world listening demands.

Speech recognition testing closes the gap. This is why a comprehensive hearing evaluation always includes speech recognition testing alongside pure-tone testing. In speech recognition testing, you listen to lists of single-syllable words presented at a comfortable volume and repeat back what you hear. Your score — the percentage you correctly identify — tells the audiologist how clearly your auditory system processes speech, not just whether it can detect sound. Two patients with identical audiograms can have dramatically different speech recognition scores, which changes the picture of how hearing loss affects their daily lives and what treatment is likely to help.

Hidden hearing loss — when the audiogram looks normal but something is clearly wrong. A growing body of research has identified a condition researchers call cochlear synaptopathy, sometimes informally called hidden hearing loss, in which the connections between the inner ear's hair cells and the auditory nerve are damaged even when the hair cells themselves are functioning normally. Because the standard audiogram measures hair cell function, it does not detect this type of damage. A person with cochlear synaptopathy can pass a standard hearing test with thresholds in the normal range while experiencing genuine, significant difficulty understanding speech in background noise — the kind of difficulty that leads them to say "I can hear fine, I just can't follow what people are saying." This is not a performance issue or a matter of attention. It is a real neurological condition that requires more than a standard pure-tone audiogram to identify.

The audiogram cannot diagnose auditory processing disorder. In auditory processing disorder (APD), the ears detect sound normally — the audiogram may be entirely within normal limits — but the brain has difficulty organizing, sequencing, filtering, or interpreting the auditory information it receives. A child who struggles to follow classroom instruction despite passing every hearing screening, or an adult who finds noisy environments cognitively exhausting despite a normal audiogram, may have APD rather than — or in addition to — conventional hearing loss. The audiogram alone cannot make this distinction. APD requires specific central auditory processing testing that goes beyond what a standard hearing evaluation includes.

It does not capture listening effort or fatigue. One of the most underrecognized consequences of hearing loss is the cognitive effort required to compensate for it. When the auditory signal is degraded, the brain works harder — filling in gaps, predicting missing sounds, integrating lip movement and context clues to reconstruct what was said. This sustained cognitive effort produces real, measurable mental fatigue. A patient whose audiogram shows only mild hearing loss may be genuinely exhausted after a full day of meetings or social interaction — not because of psychological difficulty but because of the neurological work required to hear. The audiogram does not measure this. It is only through a thorough clinical history and the patient's own account of their daily experience that this dimension of hearing loss becomes visible.

It does not account for your individual ear canal. The audiogram establishes what amplification your hearing loss requires. It does not account for the fact that every human ear canal has a unique shape, volume, and resonance. The same hearing aid, programmed to the same settings based on the same audiogram, will deliver different amplification at the eardrum in different ear canals — because the acoustic properties of the space between the receiver and the eardrum change the output. This is why real ear measurement is essential when fitting hearing aids. It uses a probe microphone placed at the eardrum to measure what the hearing aid is actually delivering — verifying that the prescription derived from your audiogram is being correctly delivered to your specific ear, not assumed to be.

It is a snapshot, not a permanent record. Your audiogram reflects your hearing on the day it was taken. Hearing loss, particularly age-related and noise-induced hearing loss, is progressive — it changes over time. An audiogram from five years ago is not an accurate picture of your hearing today, and treating current hearing loss based on an outdated audiogram produces poor outcomes. Regular re-evaluation is part of appropriate hearing healthcare, both to track changes and to update the prescriptive foundation on which your hearing aid fittings are based.

Your Audiogram, Explained Clearly

At Haynie Audiology & Hearing Associates in Freehold, a comprehensive hearing evaluation produces an audiogram that is reviewed with you in plain language — not simply handed over as a chart. You will understand what your thresholds mean, which sounds you are missing, how your results compare to the range where speech lives, and what the options are if intervention is appropriate. When hearing aids are recommended, the audiogram becomes the prescriptive foundation for programming, verified with real ear measurement to confirm the devices are delivering exactly what your ears need. No referral required. Wednesday through Saturday at 31 West Main Street in downtown Freehold, serving patients throughout Monmouth County.